<![CDATA[Penelitian ini membahas perencanaan teknis bangunan bawah jembatan, khususnya abutment pada Jembatan Rangka Baja Sungai Rokan Kiri di Kota Tengah, Kabupaten Kampar. Metode penelitian yang digunakan meliputi studi literatur dan studi desain, dengan pengumpulan data primer berupa hasil sondir, data tanah, topografi, serta hidrografi aliran sungai. Analisis dilakukan terhadap beban yang bekerja pada abutment, meliputi beban vertikal, beban horizontal, serta tekanan tanah lateral. Faktor keamanan terhadap geser (SF-{geser}) dan guling (SF-{guling}) dihitung untuk memastikan stabilitas konstruksi. Hasil perhitungan menunjukkan bahwa abutment yang direncanakan memenuhi kriteria keamanan yang dipersyaratkan, baik terhadap gaya geser maupun gaya guling, sesuai dengan standar peraturan Departemen Pekerjaan Umum. Dengan demikian, rancangan bangunan bawah jembatan ini dapat dinyatakan layak secara teknis dan aman digunakan dalam mendukung beban lalu lintas di atasnya. This study discusses the technical planning of bridge substructures, particularly the abutment of the Steel Truss Bridge over the Rokan Kiri River in Kota Tengah, Kampar Regency. The research methods employed include a literature review and design study, with primary data collection consisting of cone penetration test (CPT) results, soil data, topographic data, and river flow hydrology data. The analysis focuses on the loads acting on the abutment, including vertical loads, horizontal loads, and lateral earth pressure. Safety factors against sliding (SF_sliding) and overturning (SF_overturning) are calculated to ensure the structural stability of the abutment. The calculation results indicate that the planned abutment meets the required safety criteria against both sliding and overturning forces in accordance with the standards set by the Ministry of Public Works. Therefore, the design of the bridge substructure can be considered technically feasible and safe to support traffic loads above it. ]]>
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